LESSON 2
TROUBLESHOOT RADIO SET CONTROL C-7392( )/ARN-89( )
TASK
Troubleshoot radio set control C-7392( )/ARN-89( ).
CONDITIONS
Given a radio set control C-7392( )/ARN-89( ), radio receiver R-1496( )/ARN-
89( ), maintenance kit MK-994/AR, digital multimeter AN/USM-486, signal
generator SG-1170/U, a Number 2 pencil, and a qualified supervisory OJT
monitor.
STANDARD
Acceptable performance is obtained when the soldier can troubleshoot the C-
7392( )/ARN-89( ) to a faulty subassembly in two of three C-7392( )/ARN-89(
)s within 1 hour per fault.
1.
At the aviation intermediate maintenance (AVIM) level (direct
support), you will be expected to troubleshoot the C-7392( )/ARN-89( ) down
to a faulty subassembly. Just as you did earlier when troubleshooting the
receiver, you will replace the defective subassembly you find with a known
good one. You will then send the faulty subassembly to a higher level of
maintenance to be repaired.
2.
You will not have to learn a new procedure, since troubleshooting the
control unit is quite similar to the procedure you learned when
troubleshooting the receiver in Lesson 1. Remember, you --
a. Performed a basic test.
b. Consulted
a
fault
isolation
guide
to
identify
the
subtest
to
perform.
c. Isolated
the
fault
by
performing
the
subtests
in
the
order
presented.
NOTE:
If a fault isolation is obtained that is not included in the
fault isolation guide, then there is more than one fault.
Isolate each fault separately.
When a module replaced under a
subtest does not correct the fault, proceed with module-by-module
substitution until fault is corrected.
3.
You will need the following equipment or its equivalent:
a. Radio set control C-7392( )/ARN-89( ).
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